Vintage British Standards Institution (BSI) Conversion Slide, produced in accordance with BS 350.

A great piece of old-school British engineering equipment, designed for quickly converting between metric and Imperial/non-metric measurements.

Includes conversions covering:

* Length

* Area

* Volume

* Capacity

* Mass

* Force

* Pressure & stress

* Temperature

* Inches / millimetres

* British and American wire gauges

This example includes the original BSI conversion slide, plastic protective sleeve and instruction sheet as pictured.

The slide mechanism is present and the various conversion scales/tables remain clearly visible.

Condition: Vintage used condition with some age-related marks and wear to the slide, sleeve and paperwork. Please study all photographs carefully as they form part of the description.

An interesting collectible for engineers, draughtsmen, surveyors, machinists or collectors of vintage British scientific and technical equipment.